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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_001_014_1441">&nbsp;</a>NAME</h4><blockquote>
mkfifo - make FIFO special files
</blockquote><h4><a name = "tag_001_014_1442">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

mkfifo <b>[</b>-m <i>mode</i><b>]</b><i> file</i>...
</code>
</pre>
</blockquote><h4><a name = "tag_001_014_1443">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>mkfifo</i>
utility will create the FIFO special files
specified by the operands, in the order specified.
<p>
For each
<i>file</i>
operand, the
<i>mkfifo</i>
utility will perform actions equivalent to the <b>XSH</b> specification
<i><a href="../xsh/mkfifo.html">mkfifo()</a></i>
function, called with the following arguments:
<ol>
<p>
<li>
The
<i>file</i>
operand is used as the
<i>path</i>
argument.
<p>
<li>
The value of the bitwise inclusive
OR of
S_IRUSR,
S_IWUSR,
S_IRGRP,
S_IWGRP,
S_IROTH
and
S_IWOTH
is used as the
<i>mode</i>
argument.
(If the
<b>-m</b>
option is specified, the
<i>mode</i>
option-argument overrides this default.)
<p>
</ol>
</blockquote><h4><a name = "tag_001_014_1444">&nbsp;</a>OPTIONS</h4><blockquote>
The
<i>mkfifo</i>
utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b>&nbsp;</a> .
<p>
The following option is supported:
<dl compact>

<dt><b>-m&nbsp;</b><i>mode</i>
<dd>
Set the file permission bits of the newly-created FIFO to the specified
<i>mode</i>
value.
The
<i>mode</i>
option-argument will be the same as the
<i>mode</i>
operand defined for the
<i><a href="chmod.html">chmod</a></i>
utility.
In the
<i>symbolic_mode</i>
strings, the
<i>op</i>
characters "+" and "-" will be interpreted relative to
an assumed initial mode of
a=rw.

</dl>
</blockquote><h4><a name = "tag_001_014_1445">&nbsp;</a>OPERANDS</h4><blockquote>
The following operand is supported:
<dl compact>

<dt><i>file</i><dd>A pathname of the FIFO special file to be created.

</dl>
</blockquote><h4><a name = "tag_001_014_1446">&nbsp;</a>STDIN</h4><blockquote>
Not used.
</blockquote><h4><a name = "tag_001_014_1447">&nbsp;</a>INPUT FILES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1448">&nbsp;</a>ENVIRONMENT VARIABLES</h4><blockquote>
The following environment variables affect the execution of
<i>mkfifo</i>:
<dl compact>

<dt><i>LANG</i><dd>Provide a default value for the internationalisation variables
that are unset or null.
If
<i>LANG</i>
is unset or null, the corresponding value from the
implementation-dependent default locale will be used.
If any of the internationalisation variables contains an invalid setting, the
utility will behave as if none of the variables had been defined.

<dt><i>LC_ALL</i><dd>
If set to a non-empty string value,
override the values of all the other internationalisation variables.

<dt><i>LC_CTYPE</i><dd>
Determine the
locale for the interpretation of sequences of bytes of text data as
characters (for example, single- as opposed to multi-byte characters
in arguments).

<dt><i>LC_MESSAGES</i><dd>
Determine the locale that should be used to affect
the format and contents of diagnostic
messages written to standard error.

<dt><i>NLSPATH</i><dd>
Determine the location of message catalogues
for the processing of
<i>LC_MESSAGES .
</i>
</dl>
</blockquote><h4><a name = "tag_001_014_1449">&nbsp;</a>ASYNCHRONOUS EVENTS</h4><blockquote>
Default.
</blockquote><h4><a name = "tag_001_014_1450">&nbsp;</a>STDOUT</h4><blockquote>
Not used.
</blockquote><h4><a name = "tag_001_014_1451">&nbsp;</a>STDERR</h4><blockquote>
Used only for diagnostic messages.
</blockquote><h4><a name = "tag_001_014_1452">&nbsp;</a>OUTPUT FILES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1453">&nbsp;</a>EXTENDED DESCRIPTION</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1454">&nbsp;</a>EXIT STATUS</h4><blockquote>
The following exit values are returned:
<dl compact>

<dt>0<dd>All the specified FIFO special files
were created successfully.

<dt>&gt;0<dd>An error occurred.

</dl>
</blockquote><h4><a name = "tag_001_014_1455">&nbsp;</a>CONSEQUENCES OF ERRORS</h4><blockquote>
Default.
</blockquote><h4><a name = "tag_001_014_1456">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1457">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1458">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_001_014_1459">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="umask.html">umask</a></i>,
the <b>XSH</b> specification description of
<i><a href="../xsh/mkfifo.html">mkfifo()</a></i>.
</blockquote><hr size=2 noshade>
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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